Customer retention rate (CRR) is the percentage of customers you keep over a period, excluding any new ones acquired during it.
CRR = ((customers at end of period − new customers acquired during period) ÷ customers at start of period) × 100
You start the month with 500 customers, acquire 60 new ones, and end with 530.
((530 − 60) ÷ 500) × 100 = (470 ÷ 500) × 100 = 94% customer retention rate
Customer retention rate measures the share of customers you started a period with who are still customers at the end of it. Crucially, it counts only the existing base — new customers won during the period are excluded from the calculation, because the metric is about how well you hold on to the customers you already had, not how many you added.
CRR is the mirror image of customer (logo) churn: a 95% retention rate is simply a 5% churn rate seen from the other side, and the two always sum to 100%. It counts logos rather than revenue, so a small customer and a large one each count once — which makes CRR a clean read on broad satisfaction and product fit, but a poor one for financial impact, where revenue retention is the better lens.
Because retention compounds, small differences matter enormously over time. A business retaining 95% of customers a month keeps roughly 54% after a year; at 90% it keeps only about 28%. That gap is the difference between a sticky product that grows efficiently and a leaky bucket where every new customer just replaces one that left.
Customer retention rate is the clearest single read on whether customers stick around, and because retention compounds, even a few points separate a sticky product from a leaky bucket. High retention lifts lifetime value, lowers the acquisition you need just to stand still, and makes growth far cheaper — which is why retaining an existing customer is almost always cheaper than winning a new one and why CRR is a foundational health metric.
Healthy SaaS customer retention runs roughly 95%+ annually for enterprise (under ~1–2% annual logo churn); SMB-focused products typically see 93–95% monthly logo retention (5–7% monthly churn), with best-in-class above 98% monthly (sources: Recurly 2025 Churn Report; SaaS Capital retention data).
They are two sides of the same coin and always sum to 100%. A 95% customer retention rate is the same as a 5% customer churn rate; subtract retention from 100 to get churn, or vice versa.
Because CRR measures how well you keep the customers you already had. Counting new acquisitions would let strong sales mask poor retention, hiding a leaky bucket behind top-of-funnel growth. Excluding them isolates the durability of the existing base.
Customer retention counts logos kept, treating every customer equally; revenue retention weights each by the MRR it carries and can include expansion, so it can exceed 100% even as customer count falls.
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